Expanded-metal tension member.



PATENTED SEPT. 19, 1905.

J. KAHN. EXPANDED METAL TENSION MEMBER.

APPLICATION FILED MAR 24 1905 2 SHEETS-SHEET 1.

IIL v A,

.ydulmb witnesses fi I" No. 799,653. PATENTED SEPT. 19, 1905.

J.KAHN.

EXPANDED METAL TENSION'MEMBER.

APPLICATION FILED MAR, 24'. 1905. l

2 SHEETS-SHEET 2,

41; A WE I '7 Kw H E UNITED STATES PATENT OFFICE...

JULIUS KAHN, OF DETROIT, MICHIGAN, ASSIGNOR TO -TRU SSED CON-- CRETE STEEL COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

EXPANDED-METAL TENSION MEMBER.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Application filed March 24, 1905. Serial No. l,'752- To all whom it may concern:

vide a cheap and powerful tension member for combined concrete and metal construction that shall be so formed that the tensional stresses set up in the lower portions of such construction shall be entirely taken up by such tension member, that such stresses that are set up some distance above the lower tension member shall be provided for, thatsuch upper and lower tensionmembers shall be integrally connected by ties that shall assist in the union between the concrete and metal, and to provide means for preventing the individual tension members from being displaced rela tive to each other. I attain these objects by the construction illustrated in the accompanying drawings, in which Figure 1 is an end view, and Fig. 2 a plan,

of one of myrolled bars previous to being eX-' panded. Fig. 3 is an end view, and Fig. 4: is

a plan, of another form of bar previous to being expanded. Fig. 5 is a view-ofthe bar of Figs. 1 and 2 expanded and partially in:

closedin concrete.- Figs. 6 and 7 are side views of two forms of my expanded metal.

Fig. 8 is an end view of another form of my improved tension member. Fig. 9 is acrosssectional view of the tension member on the line 9 9 of Fig. 7. Fig. 10 is an end view of a tension member for heavy composite beams, and Fig- 1-1 is aside view of the same. Similar reference characters refer to like tion may be. used, however. The webs C beimposed moist'concrete.

' tween the rods are next sheared, preferably by passing the bars through rotary shears, in the manner shown in Figs. 2 and 4., Crosscuts D are joined at their opposite ends to .the longitudinal cuts E, extending in oppo site directions. This leaves tiev members F connected at their opposite ends to the adja cent rods. The rods are next separated, so that each alternate rod will be in a difierent plane from that next adjacent, as shown in Figs. 5. 8, 9, and 10. The tie members ex-- tend across the space between the rods, the portions of the webs that are still united to the rods forming projections Gr, to which the tie members are attached. If the rods are separated as far as possible, the tie members will extend atright angles to the rods, as in Figs. 5 and 6. If the lower rods in Fig. 5 were moved endwise in opposite directions,

the tie members on opposite sides of the upperrod would be inclined in opposite directions, as shown in Fig. 7. When concrete 1s molJed around the tensioi members, as indi-' cated by dotted lines in Figs. 6 and 7, composite trusses are formed, the concrete in each case together with the upper rod acting as the compression members of the truss. In

'Fig. 6 the action is that usually found in the Howe truss, while in-Fig. 7 the Pratt truss is exemplified. When the form shown in Fig.7 is: used, there is a possibility that the lower rods will slide endwise inoppO- site directions under the weight of the super- To prevent this, the lower rods are locked in place by means ofthe clamp H. v The upper and lower rods may be formed of the same size or their sizes may differ, as shown in Fig. 8, where the lighter upper rods K together equal the size of the clamps M- and N, which prevent them from spreading. Such a structure requires very little false work-in fact, when well construct: ed forms apowerful truss. It will be noticed that in all these constructions all the rods are of comparatively large size to withstand the tensional stresses, while the tie members are light, no great stress coming on them, their duty being merely. to hold the rods in posi- I claim as new, and desire to secure by Letters Patent, is

1. In an expanded-metal construction, the combination of a series of metal rods in one plane, a second series of parallel rods in asecond plane parallel to the first, connecting tie members extending from a rod in one plane to two adjacent rods in the other plane, all said rods and tie members being integral with each other, and cross-connecting members engaging the rods in one of the planes to hold them in position.

2. In an expanded-metal construction, the combination of a rod in one plane, a series of rods in a second plane parallel to the first, connecting tie members extending from the first rod to two adjacent rods in the plane below, all said rods and tie members being integral with each other, and a cross-connection engaging the rods in said second plane to hold them in position.

3. An expanded-metal construction, comprising a series of metal rods in one plane, a second series of parallel rods in a second plane parallel to the first, connecting tie members extending from a rod in one plane to two adjacent rods in the other plane, all said rods and tie members being integral with each other, the tie members being of less width and thickness than the rods.

4:. An expanded-metal construction comprising a rod in one plane, a plurality of rods in a different planeparallel to the first, and a series of tie members of less width and thickness than said rods to position the same, all the members being integral with each other.

5. An expanded-metal construction, comprising a rod having a series of projections on each side of the same, a pair of parallel rods lying in the same plane and having a series of reduced projections extending from their adjacent sides, and a series of tie members connecting the projections of the first rod with those of the other two, all said rods and tie members being integral with each other.

6. An expanded-metal construction comprising a rod in one plane, a plurality of rods in a different plane, and a series of tie members to position the rods, all the members being integral with each other.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JULIUS KAHN.

\Vitnesses:

ANNA MAY GREGORY, EDWARD N. PAGELSEN. 

